Telescope with displaceable reversing system.



. Hofs-79.517,2.v `PMBNTED PEB. 18, 1908.

' Y l Y NBUMAYYBR.

TELBSGOPE WITH DISPLAGEABLE RBV'ERSING SYSTEM.

'APPLIATION PILBDNOV. Z6, 1906.

' PATBNTBD FBB.18, 1908jj NQ879,572'. c u

. I E. NBUMAYER TELBSGOPB WITH, DIsPL-AGBABLE RBVERSING SYSTEM.

APPLICATION FILED NOV. 26, v1906.

a sHEBTg-SEBBT 3.

Fig.;

. ing system displaceable laccording to the innarran sTATas TATaNT oTTTca.

EDMUND NEMAYER, OF FRIEDENAU, NEAR BERLIN, GERMANY, ASSIGNOR TO THE FIRIV OF OPTISGHE ANSTA'LT C. P. GOERZ, AKTIENGESELLSCHAFT, OF FRIEDENAU, NEAR BER- LIN, GERMANY.

l TELEsooPE wrrH. DISPLACEABLE nEvEns'ING sYs'rM.

Specification of Letters Patent.

-ratented Feb. 18, 190s.

Application tiled November 26. 1906. Serial No. 345095.

To all whom it may concern:

Beit known that I, EDMUND NEUMAYER, a citizen ofthe German Empire, and resident of Friedenau, near Berlin, Germany, en- Uineer, have invented certain new and useful Improvements in Telescopes with Displaceable Reversing Systems, of which the following isa specification.

his invention-relates to telescopes p Iovided With displaceable reversing systems for obviatingl the objective-imagereversal,

-the purpose of the invention being to render possible in a very simple manner a regular chan e of the variation of the image produced by the objective of the instrument from a certain maximum of magnieation to a minimum of diminution, said eect being attained by a displaceable reversing system constructed in known manner of two positive elements and arranged so a's to be adapted to be displaced from an intermediate position of maximum separation of the elements to tWo end-positions at the two ends of thelinstrurnent vof minimum yseparation of the elements.

The arrangement of a reversing system displaceable in the mannerindicated is of particular importance vin telescopes in which a lateral displacement of the incident and emitted rays is obtained by providing sections placed at angles with regard to each other.

The invention is illustrated in the annexed drawings, Figures l to 3 'representing the optical elements of a telescope with a reversvention and comprising two separate 'positive parts, the sald reversing system, or the scope provided at the objective end witha rotatable reflector adapted to sweep the horizon, and with a device adapted to secure upright images in all positions'of the reflector. Fig. 5 shows a telescope provided with means Fig. 6 shows'the evolution of the actuating cams of the elements of the reversing system'.

In the drawings 1 is the objective and 2, 3 the ocular 4 and 5 are the ositive elements 'of the reversing system. It may be mentioned that instead of single positive lenses 4 and 5, lens-systems of positive equivalent focal length may be used. v6 is the plane of the objective-image, 7 the plane of the ocular-image. ings indicate the border-rays capable of passing through the ocular from the circumference of the image of largest diameter in the image-plane of the objective. It is obvious that With the arrangement of the lenses 4 and 5 of the reversing-system in Fig. lthe vimage in the objective image plane is reproduced on the same scale in the image-plane of the ocular, whereas w-ith the arrangement shown in Fig. 2 a powerful magnification of the ob-4 jective-'image takes place' and with the arrangement shown in Fig. 3 there is a powerful diminution. .By arranging the lenses 4, 5 in positions intermediate to those shown in Figs. 2 and 3 intermediate degrees of magnification are obtained. It must of course be noted that for any given position of one.-

lens of the reversing system there is a definite position for the other lens, unless the distance between the objective and ocular are changed at the same time. Change in the distance between the objective and ocular gives, however, independence with regard to The lines shown in the drawthe arrangement of the two lenses of thejreversin system;

In t e arrangement illustrated in Fig. 4 the objective is also marked 1, and the ocular 2, 3. The lenses forming the reversing system are marked 4 and 5, as before. In this form of telescope itis assumed that in front of the objective l a prism 8 is inserted to defleet the rays from a horizontal to a vertical path. A prism 9 serves for counteracting this deiieetion. The prism 10 serves for erecting the image in order to compensate in the known manner the effect of' the rotatable prism 8. In addition to the optical elements mentioned the telescope may be provided with supplementary optical elements not shown in the drawing, the employment of such supplementary elements being desirable in order, Jfor example, to allow of using an erecting prism 10 of small dimensions.

In the embodiment of the telescope shown in Fig. 5, the objective is again designated with the numeral 1, the ocular lenses with .the numerals 2, 3 and the optical elements of the reversing system with the numerals 1, 5. The optical elements 4, 5 of the reversing system are mounted invshort tubes 11, 12 respectively. The tubes 11, 12 are both slid- "able but non-rotatably arranged in tube 13 forming part of the telescope casing. Rotatably mounted on tube 13 of the casing is an annular ring or tube 14 provided 'on its inner surface with cut-in cams 15 and 16. Tube 11 is provided with a pin 17 and the tube 12 with a pin 1S, both pins being guided in a longitudinal slot 190i part 13 of the casing and at the same time the iirst named pin 17 in cam 15 and the last named pin 18 in cam 16. The form of cams 15 and 16 appears in detail 'from the evolution of said cams in Fig. 6; corresponding points of the cams in Figs. 5 and 6 are designated by the same reference letters c b; a I); c" b.

The operation voi' the device is obvious from the drawing: on turning the annular ring 14 tubes 11 and 12 are longitudinally displaced within tube 13 effecting a corresponding displacement of the optical elements 4, 5 of the reversing system` On dis,- placing pins 17, 18 of tubes 11 12 from the points a"b of, cams 15, 16 to points a b a variation of the image Jrom the maximum of magniiication to the maximum of diminution is produced.

Having now described and ascertained the ing witnesses.

nature of'my invention I declare that what I claim is:

1. In a telescope, an objective and an ocular mounted at an invariable distance from each other, and a reversing system comprising two independently movable separate arts 'of positive focal-length, adjustable trom an intermediate position of maximum separation to positions near either end of the telescope in which end positions the said parts are in proximity to each other, the said reversing system producing in one of the said two end-positions of its parts themaxi- 4mum of magnification and in the other the maximum ol' diminution of the objectiveimage. Y

2. In a telescope, an objective, an ocular, a tube supporting same, said tube comprising sections placed at angles to each other and securing an invariable-distance of the observers point of view from his eye, and al reversing system mounted in said tube comprising two independently movable separate parts of positive focal length, adjustable from an intermediate position of maximum separation to end positions near either end of the telescope, in which end positions the said parts are in proximity to each other the said reversing system producing in one of the said two end-positions of its parts the maxi mum of magnification and in the other the maximum oi diminution `of the objectiveimage. y

In testimony whereof I have signed this specification in the presence of two subscrib- EDMUND N EU MAYER. Witnesses:

HENRY HAsPER,

WOLDEMAR HAUPT. 

